/**
 * Created with Intellij JDEA
 * Description:
 * User:
 * Date:2022-05-13
 * Time:16:02
 */
public class 一次编辑 {
    class Solution {
        public boolean oneEditAway(String first, String second) {
            int m = first.length(), n = second.length();
            if (n - m == 1) {
                return oneInsert(first, second);
            } else if (m - n == 1) {
                return oneInsert(second, first);
            } else if (m == n) {
                boolean foundDifference = false;
                for (int i = 0; i < m; i++) {
                    if (first.charAt(i) != second.charAt(i)) {
                        if (!foundDifference) {
                            foundDifference = true;
                        } else {
                            return false;
                        }
                    }
                }
                return true;
            } else {
                return false;
            }
        }

        public boolean oneInsert(String shorter, String longer) {
            int length1 = shorter.length(), length2 = longer.length();
            int index1 = 0, index2 = 0;
            while (index1 < length1 && index2 < length2) {
                if (shorter.charAt(index1) == longer.charAt(index2)) {
                    index1++;
                }
                index2++;
                if (index2 - index1 > 1) {
                    return false;
                }
            }
            return true;
        }
    }
}
